https://bugs.llvm.org/show_bug.cgi?id=41769
Bug ID: 41769
Summary: Thread Sanitizer causes false positive on a static
array
Product: compiler-rt
Version: unspecified
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: compiler-rt
Assignee: unassignedb...@nondot.org
Reporter: vincent.lebour...@starqube.com
CC: llvm-bugs@lists.llvm.org
The following code causes a false data race detection.
~~~
#include <array>
#include <thread>
#include <vector>
class String{
public:
std::array<unsigned char,16>value;
String(const
char(&s)[2])noexcept:value(){std::memcpy(value.data(),s,1);}
};
void createStaticAndFind(){
static const std::array<String,3>a={"1","2","3"};
if(a[2].value==String("3").value){}}
int main(){
std::vector<std::thread>threads;
for(size_t i=0;i<100;++i){
threads.emplace_back(createStaticAndFind);}
return 0;}
~~~
Compiled and linked with -L/usr/local/lib and -fsanitize=thread.
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